1 For DGS-3620-28TC/28SC/28PC models only.2 For DGS-3620-28PC/52P models only.3 After R 2.5, minimum granularity down to 8 Kbps. 4 By default, the fan speed is low. When the temperature inside the chassis is over 40˚C (104 ˚F) , the fan switches to high speed until the temperature drops below 35 ˚C (95 ˚F).5 R 2.5 is supported.6 Supported by hardware version B1 and later.